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His first summer on Uncle Wes' Wyoming ranch, city-bred Andy Marvin buys the frightened sorrel pony to stop Randy Garland from beating the pony. — With cousin Sally's help, Andy masters the mischievous Sunny. The tamed pony carries Andy through danger to round up some lost horses. — Together, boy and horse help Uncle Wes track down an unscrupulous... more » band of game rustlers, and Sunny gets a reward from the Governor.« less